@article{DAN_1980_250_1_a12,
     author = {B. N. Petrov and S. F. Babak and B. G. Il'yasov and I. Yu. Yusupov},
     title = {On structures of linear stationary systems},
     journal = {Doklady Akademii Nauk},
     pages = {55--58},
     publisher = {mathdoc},
     volume = {250},
     number = {1},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_250_1_a12/}
}